Handle carbons (XEP-0280);
        
        
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Methods
(static) disable(cb)
    Disable carbons.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| cb | callback | 
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(static) enable(cb)
    Enable carbons.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| cb | callback | 
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(static) refresh(err)
    Enable/Disable carbons depending on options key.
    Parameters:
| Name | Type | Description | 
|---|---|---|
| err | error message | 
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